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Hi, If your radiator fan not working change fan switch. If you know where is the fan switch disconnect it and see if the fan work when you put car on. If not check the fusem, fan relay and fan power problem.

try hitting radiator fan motor with hammer (not extremely hard, just rap on it a few times) with the engine running and ac on. if the fan comes on the motor is bad. if that dont work it must be tested for power and ground supplied to the fan from relay (power is supplied from the relay). does the ac compressor come on? is it overheating? the fan is controlled by the powertrain control module and a scantool would be needed to see if the module is turning the fan on.

There are many things that can cause your radiator fans to not get power. However, the most common cause is the fan control module. Some people call it a "fan control relay", (including many aftermarket parts retailers) but it is actually a solid state control module, not a relay.

Check for power in and out of the module. It is best if you have access to a scan tool that has system test capabilities so you can command the fans to turn on with the computer. Otherwise, you will have to get your engine really hot and see if the power is being sent from the control module to the fan motors.

The fan control module is located on the inside of the left frame rail (driver's side) just behind the radiator. You will have to get under the vehicle to see it. It looks like the picture below.

Is your Civic air-conditioned (have two fans: radiator(on the left, facing the car) and condenser (on the right, facing the car)?
Does your radiator fan run at all, when the car gets hot?
Have you checked your radiator fan relay in your underhood fuse box (far upper left, facing the car, locations on cover)?
Have you investigated the thermostat?

on grand am the radiator fan just burns up quickly all you need to get the power wire off the radiator then just find a power that only turns on when the engine is on this is how i have my radiator fan (got the power coming off the wiper motor)